An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...
Venus, Saturn, Jupiter and Mars are all visible to the naked eye just after the sun goes down. Neptune and Uranus can also be ...
"There are still many things related to planetary formation and the early evolution of young planetary systems that we don't ...
On the evenings of Jan. 17 and 18, the planets will appear virtually side by side, in what's called a “planetary conjunction.